Authorities in Thurston County, Washington, are hunting for an apparent serial cat killer they believe is responsible for killing and mutilating at least a dozen cats in the county since February.

Seven of those cats were found dead in August, according to The New York Times.

On Tuesday, the 12th known mutilated cat was found, its body found with “carving” and “surgical-type mutilations,” Olympia Police Lt. Sam Costello told local news station Q13 Fox. He added that, as with the other cats that have been found, the body was “splayed out” and appears to have been “posed” by someone.

In some cases, cats’ bodies had been sliced all the way open and spines had been removed. In one instance earlier this month, a kitten was found beheaded,